/usr/src/linux-headers-5.15.0-190/include/linux
Edit: /usr/src/linux-headers-5.15.0-190/include/linux/irq.h (42764B)
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_IRQ_H
#define _LINUX_IRQ_H
/*
* Please do not include this file in generic code. There is currently
* no requirement for any architecture to implement anything held
* within this file.
*
* Thanks. --rmk
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
struct seq_file;
struct module;
struct msi_msg;
struct irq_affinity_desc;
enum irqchip_irq_state;
/*
* IRQ line status.
*
* Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h
*
* IRQ_TYPE_NONE - default, unspecified type
* IRQ_TYPE_EDGE_RISING - rising edge triggered
* IRQ_TYPE_EDGE_FALLING - falling edge triggered
* IRQ_TYPE_EDGE_BOTH - rising and falling edge triggered
* IRQ_TYPE_LEVEL_HIGH - high level triggered
* IRQ_TYPE_LEVEL_LOW - low level triggered
* IRQ_TYPE_LEVEL_MASK - Mask to filter out the level bits
* IRQ_TYPE_SENSE_MASK - Mask for all the above bits
* IRQ_TYPE_DEFAULT - For use by some PICs to ask irq_set_type
* to setup the HW to a sane default (used
* by irqdomain map() callbacks to synchronize
* the HW state and SW flags for a newly
* allocated descriptor).
*
* IRQ_TYPE_PROBE - Special flag for probing in progress
*
* Bits which can be modified via irq_set/clear/modify_status_flags()
* IRQ_LEVEL - Interrupt is level type. Will be also
* updated in the code when the above trigger
* bits are modified via irq_set_irq_type()
* IRQ_PER_CPU - Mark an interrupt PER_CPU. Will protect
* it from affinity setting
* IRQ_NOPROBE - Interrupt cannot be probed by autoprobing
* IRQ_NOREQUEST - Interrupt cannot be requested via
* request_irq()
* IRQ_NOTHREAD - Interrupt cannot be threaded
* IRQ_NOAUTOEN - Interrupt is not automatically enabled in
* request/setup_irq()
* IRQ_NO_BALANCING - Interrupt cannot be balanced (affinity set)
* IRQ_MOVE_PCNTXT - Interrupt can be migrated from process context
* IRQ_NESTED_THREAD - Interrupt nests into another thread
* IRQ_PER_CPU_DEVID - Dev_id is a per-cpu variable
* IRQ_IS_POLLED - Always polled by another interrupt. Exclude
* it from the spurious interrupt detection
* mechanism and from core side polling.
* IRQ_DISABLE_UNLAZY - Disable lazy irq disable
* IRQ_HIDDEN - Don't show up in /proc/interrupts
* IRQ_NO_DEBUG - Exclude from note_interrupt() debugging
*/
enum {
IRQ_TYPE_NONE = 0x00000000,
IRQ_TYPE_EDGE_RISING = 0x00000001,
IRQ_TYPE_EDGE_FALLING = 0x00000002,
IRQ_TYPE_EDGE_BOTH = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING),
IRQ_TYPE_LEVEL_HIGH = 0x00000004,
IRQ_TYPE_LEVEL_LOW = 0x00000008,
IRQ_TYPE_LEVEL_MASK = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
IRQ_TYPE_SENSE_MASK = 0x0000000f,
IRQ_TYPE_DEFAULT = IRQ_TYPE_SENSE_MASK,
IRQ_TYPE_PROBE = 0x00000010,
IRQ_LEVEL = (1 << 8),
IRQ_PER_CPU = (1 << 9),
IRQ_NOPROBE = (1 << 10),
IRQ_NOREQUEST = (1 << 11),
IRQ_NOAUTOEN = (1 << 12),
IRQ_NO_BALANCING = (1 << 13),
IRQ_MOVE_PCNTXT = (1 << 14),
IRQ_NESTED_THREAD = (1 << 15),
IRQ_NOTHREAD = (1 << 16),
IRQ_PER_CPU_DEVID = (1 << 17),
IRQ_IS_POLLED = (1 << 18),
IRQ_DISABLE_UNLAZY = (1 << 19),
IRQ_HIDDEN = (1 << 20),
IRQ_NO_DEBUG = (1 << 21),
};
#define IRQF_MODIFY_MASK \
(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \
IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY | IRQ_HIDDEN)
#define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
/*
* Return value for chip->irq_set_affinity()
*
* IRQ_SET_MASK_OK - OK, core updates irq_common_data.affinity
* IRQ_SET_MASK_NOCPY - OK, chip did update irq_common_data.affinity
* IRQ_SET_MASK_OK_DONE - Same as IRQ_SET_MASK_OK for core. Special code to
* support stacked irqchips, which indicates skipping
* all descendant irqchips.
*/
enum {
IRQ_SET_MASK_OK = 0,
IRQ_SET_MASK_OK_NOCOPY,
IRQ_SET_MASK_OK_DONE,
};
struct msi_desc;
struct irq_domain;
/**
* struct irq_common_data - per irq data shared by all irqchips
* @state_use_accessors: status information for irq chip functions.
* Use accessor functions to deal with it
* @node: node index useful for balancing
* @handler_data: per-IRQ data for the irq_chip methods
* @affinity: IRQ affinity on SMP. If this is an IPI
* related irq, then this is the mask of the
* CPUs to which an IPI can be sent.
* @effective_affinity: The effective IRQ affinity on SMP as some irq
* chips do not allow multi CPU destinations.
* A subset of @affinity.
* @msi_desc: MSI descriptor
* @ipi_offset: Offset of first IPI target cpu in @affinity. Optional.
*/
struct irq_common_data {
unsigned int __private state_use_accessors;
#ifdef CONFIG_NUMA
unsigned int node;
#endif
void *handler_data;
struct msi_desc *msi_desc;
cpumask_var_t affinity;
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
cpumask_var_t effective_affinity;
#endif
#ifdef CONFIG_GENERIC_IRQ_IPI
unsigned int ipi_offset;
#endif
};
/**
* struct irq_data - per irq chip data passed down to chip functions
* @mask: precomputed bitmask for accessing the chip registers
* @irq: interrupt number
* @hwirq: hardware interrupt number, local to the interrupt domain
* @common: point to data shared by all irqchips
* @chip: low level interrupt hardware access
* @domain: Interrupt translation domain; responsible for mapping
* between hwirq number and linux irq number.
* @parent_data: pointer to parent struct irq_data to support hierarchy
* irq_domain
* @chip_data: platform-specific per-chip private data for the chip
* methods, to allow shared chip implementations
*/
struct irq_data {
u32 mask;
unsigned int irq;
unsigned long hwirq;
struct irq_common_data *common;
struct irq_chip *chip;
struct irq_domain *domain;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
struct irq_data *parent_data;
#endif
void *chip_data;
};
/*
* Bit masks for irq_common_data.state_use_accessors
*
* IRQD_TRIGGER_MASK - Mask for the trigger type bits
* IRQD_SETAFFINITY_PENDING - Affinity setting is pending
* IRQD_ACTIVATED - Interrupt has already been activated
* IRQD_NO_BALANCING - Balancing disabled for this IRQ
* IRQD_PER_CPU - Interrupt is per cpu
* IRQD_AFFINITY_SET - Interrupt affinity was set
* IRQD_LEVEL - Interrupt is level triggered
* IRQD_WAKEUP_STATE - Interrupt is configured for wakeup
* from suspend
* IRQD_MOVE_PCNTXT - Interrupt can be moved in process
* context
* IRQD_IRQ_DISABLED - Disabled state of the interrupt
* IRQD_IRQ_MASKED - Masked state of the interrupt
* IRQD_IRQ_INPROGRESS - In progress state of the interrupt
* IRQD_WAKEUP_ARMED - Wakeup mode armed
* IRQD_FORWARDED_TO_VCPU - The interrupt is forwarded to a VCPU
* IRQD_AFFINITY_MANAGED - Affinity is auto-managed by the kernel
* IRQD_IRQ_STARTED - Startup state of the interrupt
* IRQD_MANAGED_SHUTDOWN - Interrupt was shutdown due to empty affinity
* mask. Applies only to affinity managed irqs.
* IRQD_SINGLE_TARGET - IRQ allows only a single affinity target
* IRQD_DEFAULT_TRIGGER_SET - Expected trigger already been set
* IRQD_CAN_RESERVE - Can use reservation mode
* IRQD_MSI_NOMASK_QUIRK - Non-maskable MSI quirk for affinity change
* required
* IRQD_HANDLE_ENFORCE_IRQCTX - Enforce that handle_irq_*() is only invoked
* from actual interrupt context.
* IRQD_AFFINITY_ON_ACTIVATE - Affinity is set on activation. Don't call
* irq_chip::irq_set_affinity() when deactivated.
* IRQD_IRQ_ENABLED_ON_SUSPEND - Interrupt is enabled on suspend by irq pm if
* irqchip have flag IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND set.
*/
enum {
IRQD_TRIGGER_MASK = 0xf,
IRQD_SETAFFINITY_PENDING = (1 << 8),
IRQD_ACTIVATED = (1 << 9),
IRQD_NO_BALANCING = (1 << 10),
IRQD_PER_CPU = (1 << 11),
IRQD_AFFINITY_SET = (1 << 12),
IRQD_LEVEL = (1 << 13),
IRQD_WAKEUP_STATE = (1 << 14),
IRQD_MOVE_PCNTXT = (1 << 15),
IRQD_IRQ_DISABLED = (1 << 16),
IRQD_IRQ_MASKED = (1 << 17),
IRQD_IRQ_INPROGRESS = (1 << 18),
IRQD_WAKEUP_ARMED = (1 << 19),
IRQD_FORWARDED_TO_VCPU = (1 << 20),
IRQD_AFFINITY_MANAGED = (1 << 21),
IRQD_IRQ_STARTED = (1 << 22),
IRQD_MANAGED_SHUTDOWN = (1 << 23),
IRQD_SINGLE_TARGET = (1 << 24),
IRQD_DEFAULT_TRIGGER_SET = (1 << 25),
IRQD_CAN_RESERVE = (1 << 26),
IRQD_MSI_NOMASK_QUIRK = (1 << 27),
IRQD_HANDLE_ENFORCE_IRQCTX = (1 << 28),
IRQD_AFFINITY_ON_ACTIVATE = (1 << 29),
IRQD_IRQ_ENABLED_ON_SUSPEND = (1 << 30),
};
#define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
static inline bool irqd_is_setaffinity_pending(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_SETAFFINITY_PENDING;
}
static inline bool irqd_is_per_cpu(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_PER_CPU;
}
static inline bool irqd_can_balance(struct irq_data *d)
{
return !(__irqd_to_state(d) & (IRQD_PER_CPU | IRQD_NO_BALANCING));
}
static inline bool irqd_affinity_was_set(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_AFFINITY_SET;
}
static inline void irqd_mark_affinity_was_set(struct irq_data *d)
{
__irqd_to_state(d) |= IRQD_AFFINITY_SET;
}
static inline bool irqd_trigger_type_was_set(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_DEFAULT_TRIGGER_SET;
}
static inline u32 irqd_get_trigger_type(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_TRIGGER_MASK;
}
/*
* Must only be called inside irq_chip.irq_set_type() functions or
* from the DT/ACPI setup code.
*/
static inline void irqd_set_trigger_type(struct irq_data *d, u32 type)
{
__irqd_to_state(d) &= ~IRQD_TRIGGER_MASK;
__irqd_to_state(d) |= type & IRQD_TRIGGER_MASK;
__irqd_to_state(d) |= IRQD_DEFAULT_TRIGGER_SET;
}
static inline bool irqd_is_level_type(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_LEVEL;
}
/*
* Must only be called of irqchip.irq_set_affinity() or low level
* hierarchy domain allocation functions.
*/
static inline void irqd_set_single_target(struct irq_data *d)
{
__irqd_to_state(d) |= IRQD_SINGLE_TARGET;
}
static inline bool irqd_is_single_target(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_SINGLE_TARGET;
}
static inline void irqd_set_handle_enforce_irqctx(struct irq_data *d)
{
__irqd_to_state(d) |= IRQD_HANDLE_ENFORCE_IRQCTX;
}
static inline bool irqd_is_handle_enforce_irqctx(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_HANDLE_ENFORCE_IRQCTX;
}
static inline bool irqd_is_enabled_on_suspend(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_IRQ_ENABLED_ON_SUSPEND;
}
static inline bool irqd_is_wakeup_set(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_WAKEUP_STATE;
}
static inline bool irqd_can_move_in_process_context(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_MOVE_PCNTXT;
}
static inline bool irqd_irq_disabled(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_IRQ_DISABLED;
}
static inline bool irqd_irq_masked(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_IRQ_MASKED;
}
static inline bool irqd_irq_inprogress(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_IRQ_INPROGRESS;
}
static inline bool irqd_is_wakeup_armed(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_WAKEUP_ARMED;
}
static inline bool irqd_is_forwarded_to_vcpu(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_FORWARDED_TO_VCPU;
}
static inline void irqd_set_forwarded_to_vcpu(struct irq_data *d)
{
__irqd_to_state(d) |= IRQD_FORWARDED_TO_VCPU;
}
static inline void irqd_clr_forwarded_to_vcpu(struct irq_data *d)
{
__irqd_to_state(d) &= ~IRQD_FORWARDED_TO_VCPU;
}
static inline bool irqd_affinity_is_managed(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_AFFINITY_MANAGED;
}
static inline bool irqd_is_activated(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_ACTIVATED;
}
static inline void irqd_set_activated(struct irq_data *d)
{
__irqd_to_state(d) |= IRQD_ACTIVATED;
}
static inline void irqd_clr_activated(struct irq_data *d)
{
__irqd_to_state(d) &= ~IRQD_ACTIVATED;
}
static inline bool irqd_is_started(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_IRQ_STARTED;
}
static inline bool irqd_is_managed_and_shutdown(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_MANAGED_SHUTDOWN;
}
static inline void irqd_set_can_reserve(struct irq_data *d)
{
__irqd_to_state(d) |= IRQD_CAN_RESERVE;
}
static inline void irqd_clr_can_reserve(struct irq_data *d)
{
__irqd_to_state(d) &= ~IRQD_CAN_RESERVE;
}
static inline bool irqd_can_reserve(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_CAN_RESERVE;
}
static inline void irqd_set_msi_nomask_quirk(struct irq_data *d)
{
__irqd_to_state(d) |= IRQD_MSI_NOMASK_QUIRK;
}
static inline void irqd_clr_msi_nomask_quirk(struct irq_data *d)
{
__irqd_to_state(d) &= ~IRQD_MSI_NOMASK_QUIRK;
}
static inline bool irqd_msi_nomask_quirk(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_MSI_NOMASK_QUIRK;
}
static inline void irqd_set_affinity_on_activate(struct irq_data *d)
{
__irqd_to_state(d) |= IRQD_AFFINITY_ON_ACTIVATE;
}
static inline bool irqd_affinity_on_activate(struct irq_data *d)
{
return __irqd_to_state(d) & IRQD_AFFINITY_ON_ACTIVATE;
}
#undef __irqd_to_state
static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
{
return d->hwirq;
}
/**
* struct irq_chip - hardware interrupt chip descriptor
*
* @parent_device: pointer to parent device for irqchip
* @name: name for /proc/interrupts
* @irq_startup: start up the interrupt (defaults to ->enable if NULL)
* @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)
* @irq_enable: enable the interrupt (defaults to chip->unmask if NULL)
* @irq_disable: disable the interrupt
* @irq_ack: start of a new interrupt
* @irq_mask: mask an interrupt source
* @irq_mask_ack: ack and mask an interrupt source
* @irq_unmask: unmask an interrupt source
* @irq_eoi: end of interrupt
* @irq_set_affinity: Set the CPU affinity on SMP machines. If the force
* argument is true, it tells the driver to
* unconditionally apply the affinity setting. Sanity
* checks against the supplied affinity mask are not
* required. This is used for CPU hotplug where the
* target CPU is not yet set in the cpu_online_mask.
* @irq_retrigger: resend an IRQ to the CPU
* @irq_set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
* @irq_set_wake: enable/disable power-management wake-on of an IRQ
* @irq_bus_lock: function to lock access to slow bus (i2c) chips
* @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
* @irq_cpu_online: configure an interrupt source for a secondary CPU
* @irq_cpu_offline: un-configure an interrupt source for a secondary CPU
* @irq_suspend: function called from core code on suspend once per
* chip, when one or more interrupts are installed
* @irq_resume: function called from core code on resume once per chip,
* when one ore more interrupts are installed
* @irq_pm_shutdown: function called from core code on shutdown once per chip
* @irq_calc_mask: Optional function to set irq_data.mask for special cases
* @irq_print_chip: optional to print special chip info in show_interrupts
* @irq_request_resources: optional to request resources before calling
* any other callback related to this irq
* @irq_release_resources: optional to release resources acquired with
* irq_request_resources
* @irq_compose_msi_msg: optional to compose message content for MSI
* @irq_write_msi_msg: optional to write message content for MSI
* @irq_get_irqchip_state: return the internal state of an interrupt
* @irq_set_irqchip_state: set the internal state of a interrupt
* @irq_set_vcpu_affinity: optional to target a vCPU in a virtual machine
* @ipi_send_single: send a single IPI to destination cpus
* @ipi_send_mask: send an IPI to destination cpus in cpumask
* @irq_nmi_setup: function called from core code before enabling an NMI
* @irq_nmi_teardown: function called from core code after disabling an NMI
* @flags: chip specific flags
*/
struct irq_chip {
struct device *parent_device;
const char *name;
unsigned int (*irq_startup)(struct irq_data *data);
void (*irq_shutdown)(struct irq_data *data);
void (*irq_enable)(struct irq_data *data);
void (*irq_disable)(struct irq_data *data);
void (*irq_ack)(struct irq_data *data);
void (*irq_mask)(struct irq_data *data);
void (*irq_mask_ack)(struct irq_data *data);
void (*irq_unmask)(struct irq_data *data);
void (*irq_eoi)(struct irq_data *data);
int (*irq_set_affinity)(struct irq_data *data, const struct cpumask *dest, bool force);
int (*irq_retrigger)(struct irq_data *data);
int (*irq_set_type)(struct irq_data *data, unsigned int flow_type);
int (*irq_set_wake)(struct irq_data *data, unsigned int on);
void (*irq_bus_lock)(struct irq_data *data);
void (*irq_bus_sync_unlock)(struct irq_data *data);
void (*irq_cpu_online)(struct irq_data *data);
void (*irq_cpu_offline)(struct irq_data *data);
void (*irq_suspend)(struct irq_data *data);
void (*irq_resume)(struct irq_data *data);
void (*irq_pm_shutdown)(struct irq_data *data);
void (*irq_calc_mask)(struct irq_data *data);
void (*irq_print_chip)(struct irq_data *data, struct seq_file *p);
int (*irq_request_resources)(struct irq_data *data);
void (*irq_release_resources)(struct irq_data *data);
void (*irq_compose_msi_msg)(struct irq_data *data, struct msi_msg *msg);
void (*irq_write_msi_msg)(struct irq_data *data, struct msi_msg *msg);
int (*irq_get_irqchip_state)(struct irq_data *data, enum irqchip_irq_state which, bool *state);
int (*irq_set_irqchip_state)(struct irq_data *data, enum irqchip_irq_state which, bool state);
int (*irq_set_vcpu_affinity)(struct irq_data *data, void *vcpu_info);
void (*ipi_send_single)(struct irq_data *data, unsigned int cpu);
void (*ipi_send_mask)(struct irq_data *data, const struct cpumask *dest);
int (*irq_nmi_setup)(struct irq_data *data);
void (*irq_nmi_teardown)(struct irq_data *data);
unsigned long flags;
};
/*
* irq_chip specific flags
*
* IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type()
* IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled
* IRQCHIP_MASK_ON_SUSPEND: Mask non wake irqs in the suspend path
* IRQCHIP_ONOFFLINE_ENABLED: Only call irq_on/off_line callbacks
* when irq enabled
* IRQCHIP_SKIP_SET_WAKE: Skip chip.irq_set_wake(), for this irq chip
* IRQCHIP_ONESHOT_SAFE: One shot does not require mask/unmask
* IRQCHIP_EOI_THREADED: Chip requires eoi() on unmask in threaded mode
* IRQCHIP_SUPPORTS_LEVEL_MSI: Chip can provide two doorbells for Level MSIs
* IRQCHIP_SUPPORTS_NMI: Chip can deliver NMIs, only for root irqchips
* IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND: Invokes __enable_irq()/__disable_irq() for wake irqs
* in the suspend path if they are in disabled state
* IRQCHIP_AFFINITY_PRE_STARTUP: Default affinity update before startup
*/
enum {
IRQCHIP_SET_TYPE_MASKED = (1 << 0),
IRQCHIP_EOI_IF_HANDLED = (1 << 1),
IRQCHIP_MASK_ON_SUSPEND = (1 << 2),
IRQCHIP_ONOFFLINE_ENABLED = (1 << 3),
IRQCHIP_SKIP_SET_WAKE = (1 << 4),
IRQCHIP_ONESHOT_SAFE = (1 << 5),
IRQCHIP_EOI_THREADED = (1 << 6),
IRQCHIP_SUPPORTS_LEVEL_MSI = (1 << 7),
IRQCHIP_SUPPORTS_NMI = (1 << 8),
IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND = (1 << 9),
IRQCHIP_AFFINITY_PRE_STARTUP = (1 << 10),
};
#include
/*
* Pick up the arch-dependent methods:
*/
#include
#ifndef NR_IRQS_LEGACY
# define NR_IRQS_LEGACY 0
#endif
#ifndef ARCH_IRQ_INIT_FLAGS
# define ARCH_IRQ_INIT_FLAGS 0
#endif
#define IRQ_DEFAULT_INIT_FLAGS ARCH_IRQ_INIT_FLAGS
struct irqaction;
extern int setup_percpu_irq(unsigned int irq, struct irqaction *new);
extern void remove_percpu_irq(unsigned int irq, struct irqaction *act);
extern void irq_cpu_online(void);
extern void irq_cpu_offline(void);
extern int irq_set_affinity_locked(struct irq_data *data,
const struct cpumask *cpumask, bool force);
extern int irq_set_vcpu_affinity(unsigned int irq, void *vcpu_info);
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_IRQ_MIGRATION)
extern void irq_migrate_all_off_this_cpu(void);
extern int irq_affinity_online_cpu(unsigned int cpu);
#else
# define irq_affinity_online_cpu NULL
#endif
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
void __irq_move_irq(struct irq_data *data);
static inline void irq_move_irq(struct irq_data *data)
{
if (unlikely(irqd_is_setaffinity_pending(data)))
__irq_move_irq(data);
}
void irq_move_masked_irq(struct irq_data *data);
void irq_force_complete_move(struct irq_desc *desc);
#else
static inline void irq_move_irq(struct irq_data *data) { }
static inline void irq_move_masked_irq(struct irq_data *data) { }
static inline void irq_force_complete_move(struct irq_desc *desc) { }
#endif
extern int no_irq_affinity;
#ifdef CONFIG_HARDIRQS_SW_RESEND
int irq_set_parent(int irq, int parent_irq);
#else
static inline int irq_set_parent(int irq, int parent_irq)
{
return 0;
}
#endif
/*
* Built-in IRQ handlers for various IRQ types,
* callable via desc->handle_irq()
*/
extern void handle_level_irq(struct irq_desc *desc);
extern void handle_fasteoi_irq(struct irq_desc *desc);
extern void handle_edge_irq(struct irq_desc *desc);
extern void handle_edge_eoi_irq(struct irq_desc *desc);
extern void handle_simple_irq(struct irq_desc *desc);
extern void handle_untracked_irq(struct irq_desc *desc);
extern void handle_percpu_irq(struct irq_desc *desc);
extern void handle_percpu_devid_irq(struct irq_desc *desc);
extern void handle_bad_irq(struct irq_desc *desc);
extern void handle_nested_irq(unsigned int irq);
extern void handle_fasteoi_nmi(struct irq_desc *desc);
extern void handle_percpu_devid_fasteoi_nmi(struct irq_desc *desc);
extern int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg);
extern int irq_chip_pm_get(struct irq_data *data);
extern int irq_chip_pm_put(struct irq_data *data);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
extern void handle_fasteoi_ack_irq(struct irq_desc *desc);
extern void handle_fasteoi_mask_irq(struct irq_desc *desc);
extern int irq_chip_set_parent_state(struct irq_data *data,
enum irqchip_irq_state which,
bool val);
extern int irq_chip_get_parent_state(struct irq_data *data,
enum irqchip_irq_state which,
bool *state);
extern void irq_chip_enable_parent(struct irq_data *data);
extern void irq_chip_disable_parent(struct irq_data *data);
extern void irq_chip_ack_parent(struct irq_data *data);
extern int irq_chip_retrigger_hierarchy(struct irq_data *data);
extern void irq_chip_mask_parent(struct irq_data *data);
extern void irq_chip_mask_ack_parent(struct irq_data *data);
extern void irq_chip_unmask_parent(struct irq_data *data);
extern void irq_chip_eoi_parent(struct irq_data *data);
extern int irq_chip_set_affinity_parent(struct irq_data *data,
const struct cpumask *dest,
bool force);
extern int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on);
extern int irq_chip_set_vcpu_affinity_parent(struct irq_data *data,
void *vcpu_info);
extern int irq_chip_set_type_parent(struct irq_data *data, unsigned int type);
extern int irq_chip_request_resources_parent(struct irq_data *data);
extern void irq_chip_release_resources_parent(struct irq_data *data);
#endif
/* Handling of unhandled and spurious interrupts: */
extern void note_interrupt(struct irq_desc *desc, irqreturn_t action_ret);
/* Enable/disable irq debugging output: */
extern int noirqdebug_setup(char *str);
/* Checks whether the interrupt can be requested by request_irq(): */
extern int can_request_irq(unsigned int irq, unsigned long irqflags);
/* Dummy irq-chip implementations: */
extern struct irq_chip no_irq_chip;
extern struct irq_chip dummy_irq_chip;
extern void
irq_set_chip_and_handler_name(unsigned int irq, const struct irq_chip *chip,
irq_flow_handler_t handle, const char *name);
static inline void irq_set_chip_and_handler(unsigned int irq,
const struct irq_chip *chip,
irq_flow_handler_t handle)
{
irq_set_chip_and_handler_name(irq, chip, handle, NULL);
}
extern int irq_set_percpu_devid(unsigned int irq);
extern int irq_set_percpu_devid_partition(unsigned int irq,
const struct cpumask *affinity);
extern int irq_get_percpu_devid_partition(unsigned int irq,
struct cpumask *affinity);
extern void
__irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
const char *name);
static inline void
irq_set_handler(unsigned int irq, irq_flow_handler_t handle)
{
__irq_set_handler(irq, handle, 0, NULL);
}
/*
* Set a highlevel chained flow handler for a given IRQ.
* (a chained handler is automatically enabled and set to
* IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD)
*/
static inline void
irq_set_chained_handler(unsigned int irq, irq_flow_handler_t handle)
{
__irq_set_handler(irq, handle, 1, NULL);
}
/*
* Set a highlevel chained flow handler and its data for a given IRQ.
* (a chained handler is automatically enabled and set to
* IRQ_NOREQUEST, IRQ_NOPROBE, and IRQ_NOTHREAD)
*/
void
irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
void *data);
void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set);
static inline void irq_set_status_flags(unsigned int irq, unsigned long set)
{
irq_modify_status(irq, 0, set);
}
static inline void irq_clear_status_flags(unsigned int irq, unsigned long clr)
{
irq_modify_status(irq, clr, 0);
}
static inline void irq_set_noprobe(unsigned int irq)
{
irq_modify_status(irq, 0, IRQ_NOPROBE);
}
static inline void irq_set_probe(unsigned int irq)
{
irq_modify_status(irq, IRQ_NOPROBE, 0);
}
static inline void irq_set_nothread(unsigned int irq)
{
irq_modify_status(irq, 0, IRQ_NOTHREAD);
}
static inline void irq_set_thread(unsigned int irq)
{
irq_modify_status(irq, IRQ_NOTHREAD, 0);
}
static inline void irq_set_nested_thread(unsigned int irq, bool nest)
{
if (nest)
irq_set_status_flags(irq, IRQ_NESTED_THREAD);
else
irq_clear_status_flags(irq, IRQ_NESTED_THREAD);
}
static inline void irq_set_percpu_devid_flags(unsigned int irq)
{
irq_set_status_flags(irq,
IRQ_NOAUTOEN | IRQ_PER_CPU | IRQ_NOTHREAD |
IRQ_NOPROBE | IRQ_PER_CPU_DEVID);
}
/* Set/get chip/data for an IRQ: */
extern int irq_set_chip(unsigned int irq, const struct irq_chip *chip);
extern int irq_set_handler_data(unsigned int irq, void *data);
extern int irq_set_chip_data(unsigned int irq, void *data);
extern int irq_set_irq_type(unsigned int irq, unsigned int type);
extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry);
extern int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset,
struct msi_desc *entry);
extern struct irq_data *irq_get_irq_data(unsigned int irq);
static inline struct irq_chip *irq_get_chip(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->chip : NULL;
}
static inline struct irq_chip *irq_data_get_irq_chip(struct irq_data *d)
{
return d->chip;
}
static inline void *irq_get_chip_data(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->chip_data : NULL;
}
static inline void *irq_data_get_irq_chip_data(struct irq_data *d)
{
return d->chip_data;
}
static inline void *irq_get_handler_data(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->common->handler_data : NULL;
}
static inline void *irq_data_get_irq_handler_data(struct irq_data *d)
{
return d->common->handler_data;
}
static inline struct msi_desc *irq_get_msi_desc(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? d->common->msi_desc : NULL;
}
static inline struct msi_desc *irq_data_get_msi_desc(struct irq_data *d)
{
return d->common->msi_desc;
}
static inline u32 irq_get_trigger_type(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? irqd_get_trigger_type(d) : 0;
}
static inline int irq_common_data_get_node(struct irq_common_data *d)
{
#ifdef CONFIG_NUMA
return d->node;
#else
return 0;
#endif
}
static inline int irq_data_get_node(struct irq_data *d)
{
return irq_common_data_get_node(d->common);
}
static inline struct cpumask *irq_data_get_affinity_mask(struct irq_data *d)
{
return d->common->affinity;
}
static inline void irq_data_update_affinity(struct irq_data *d,
const struct cpumask *m)
{
cpumask_copy(d->common->affinity, m);
}
static inline struct cpumask *irq_get_affinity_mask(int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? irq_data_get_affinity_mask(d) : NULL;
}
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
static inline
struct cpumask *irq_data_get_effective_affinity_mask(struct irq_data *d)
{
return d->common->effective_affinity;
}
static inline void irq_data_update_effective_affinity(struct irq_data *d,
const struct cpumask *m)
{
cpumask_copy(d->common->effective_affinity, m);
}
#else
static inline void irq_data_update_effective_affinity(struct irq_data *d,
const struct cpumask *m)
{
}
static inline
struct cpumask *irq_data_get_effective_affinity_mask(struct irq_data *d)
{
return irq_data_get_affinity_mask(d);
}
#endif
static inline struct cpumask *irq_get_effective_affinity_mask(unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
return d ? irq_data_get_effective_affinity_mask(d) : NULL;
}
unsigned int arch_dynirq_lower_bound(unsigned int from);
int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,
struct module *owner,
const struct irq_affinity_desc *affinity);
int __devm_irq_alloc_descs(struct device *dev, int irq, unsigned int from,
unsigned int cnt, int node, struct module *owner,
const struct irq_affinity_desc *affinity);
/* use macros to avoid needing export.h for THIS_MODULE */
#define irq_alloc_descs(irq, from, cnt, node) \
__irq_alloc_descs(irq, from, cnt, node, THIS_MODULE, NULL)
#define irq_alloc_desc(node) \
irq_alloc_descs(-1, 1, 1, node)
#define irq_alloc_desc_at(at, node) \
irq_alloc_descs(at, at, 1, node)
#define irq_alloc_desc_from(from, node) \
irq_alloc_descs(-1, from, 1, node)
#define irq_alloc_descs_from(from, cnt, node) \
irq_alloc_descs(-1, from, cnt, node)
#define devm_irq_alloc_descs(dev, irq, from, cnt, node) \
__devm_irq_alloc_descs(dev, irq, from, cnt, node, THIS_MODULE, NULL)
#define devm_irq_alloc_desc(dev, node) \
devm_irq_alloc_descs(dev, -1, 1, 1, node)
#define devm_irq_alloc_desc_at(dev, at, node) \
devm_irq_alloc_descs(dev, at, at, 1, node)
#define devm_irq_alloc_desc_from(dev, from, node) \
devm_irq_alloc_descs(dev, -1, from, 1, node)
#define devm_irq_alloc_descs_from(dev, from, cnt, node) \
devm_irq_alloc_descs(dev, -1, from, cnt, node)
void irq_free_descs(unsigned int irq, unsigned int cnt);
static inline void irq_free_desc(unsigned int irq)
{
irq_free_descs(irq, 1);
}
#ifdef CONFIG_GENERIC_IRQ_LEGACY
void irq_init_desc(unsigned int irq);
#endif
/**
* struct irq_chip_regs - register offsets for struct irq_gci
* @enable: Enable register offset to reg_base
* @disable: Disable register offset to reg_base
* @mask: Mask register offset to reg_base
* @ack: Ack register offset to reg_base
* @eoi: Eoi register offset to reg_base
* @type: Type configuration register offset to reg_base
* @polarity: Polarity configuration register offset to reg_base
*/
struct irq_chip_regs {
unsigned long enable;
unsigned long disable;
unsigned long mask;
unsigned long ack;
unsigned long eoi;
unsigned long type;
unsigned long polarity;
};
/**
* struct irq_chip_type - Generic interrupt chip instance for a flow type
* @chip: The real interrupt chip which provides the callbacks
* @regs: Register offsets for this chip
* @handler: Flow handler associated with this chip
* @type: Chip can handle these flow types
* @mask_cache_priv: Cached mask register private to the chip type
* @mask_cache: Pointer to cached mask register
*
* A irq_generic_chip can have several instances of irq_chip_type when
* it requires different functions and register offsets for different
* flow types.
*/
struct irq_chip_type {
struct irq_chip chip;
struct irq_chip_regs regs;
irq_flow_handler_t handler;
u32 type;
u32 mask_cache_priv;
u32 *mask_cache;
};
/**
* struct irq_chip_generic - Generic irq chip data structure
* @lock: Lock to protect register and cache data access
* @reg_base: Register base address (virtual)
* @reg_readl: Alternate I/O accessor (defaults to readl if NULL)
* @reg_writel: Alternate I/O accessor (defaults to writel if NULL)
* @suspend: Function called from core code on suspend once per
* chip; can be useful instead of irq_chip::suspend to
* handle chip details even when no interrupts are in use
* @resume: Function called from core code on resume once per chip;
* can be useful instead of irq_chip::suspend to handle
* chip details even when no interrupts are in use
* @irq_base: Interrupt base nr for this chip
* @irq_cnt: Number of interrupts handled by this chip
* @mask_cache: Cached mask register shared between all chip types
* @type_cache: Cached type register
* @polarity_cache: Cached polarity register
* @wake_enabled: Interrupt can wakeup from suspend
* @wake_active: Interrupt is marked as an wakeup from suspend source
* @num_ct: Number of available irq_chip_type instances (usually 1)
* @private: Private data for non generic chip callbacks
* @installed: bitfield to denote installed interrupts
* @unused: bitfield to denote unused interrupts
* @domain: irq domain pointer
* @list: List head for keeping track of instances
* @chip_types: Array of interrupt irq_chip_types
*
* Note, that irq_chip_generic can have multiple irq_chip_type
* implementations which can be associated to a particular irq line of
* an irq_chip_generic instance. That allows to share and protect
* state in an irq_chip_generic instance when we need to implement
* different flow mechanisms (level/edge) for it.
*/
struct irq_chip_generic {
raw_spinlock_t lock;
void __iomem *reg_base;
u32 (*reg_readl)(void __iomem *addr);
void (*reg_writel)(u32 val, void __iomem *addr);
void (*suspend)(struct irq_chip_generic *gc);
void (*resume)(struct irq_chip_generic *gc);
unsigned int irq_base;
unsigned int irq_cnt;
u32 mask_cache;
u32 type_cache;
u32 polarity_cache;
u32 wake_enabled;
u32 wake_active;
unsigned int num_ct;
void *private;
unsigned long installed;
unsigned long unused;
struct irq_domain *domain;
struct list_head list;
struct irq_chip_type chip_types[];
};
/**
* enum irq_gc_flags - Initialization flags for generic irq chips
* @IRQ_GC_INIT_MASK_CACHE: Initialize the mask_cache by reading mask reg
* @IRQ_GC_INIT_NESTED_LOCK: Set the lock class of the irqs to nested for
* irq chips which need to call irq_set_wake() on
* the parent irq. Usually GPIO implementations
* @IRQ_GC_MASK_CACHE_PER_TYPE: Mask cache is chip type private
* @IRQ_GC_NO_MASK: Do not calculate irq_data->mask
* @IRQ_GC_BE_IO: Use big-endian register accesses (default: LE)
*/
enum irq_gc_flags {
IRQ_GC_INIT_MASK_CACHE = 1 << 0,
IRQ_GC_INIT_NESTED_LOCK = 1 << 1,
IRQ_GC_MASK_CACHE_PER_TYPE = 1 << 2,
IRQ_GC_NO_MASK = 1 << 3,
IRQ_GC_BE_IO = 1 << 4,
};
/*
* struct irq_domain_chip_generic - Generic irq chip data structure for irq domains
* @irqs_per_chip: Number of interrupts per chip
* @num_chips: Number of chips
* @irq_flags_to_set: IRQ* flags to set on irq setup
* @irq_flags_to_clear: IRQ* flags to clear on irq setup
* @gc_flags: Generic chip specific setup flags
* @gc: Array of pointers to generic interrupt chips
*/
struct irq_domain_chip_generic {
unsigned int irqs_per_chip;
unsigned int num_chips;
unsigned int irq_flags_to_clear;
unsigned int irq_flags_to_set;
enum irq_gc_flags gc_flags;
struct irq_chip_generic *gc[];
};
/* Generic chip callback functions */
void irq_gc_noop(struct irq_data *d);
void irq_gc_mask_disable_reg(struct irq_data *d);
void irq_gc_mask_set_bit(struct irq_data *d);
void irq_gc_mask_clr_bit(struct irq_data *d);
void irq_gc_unmask_enable_reg(struct irq_data *d);
void irq_gc_ack_set_bit(struct irq_data *d);
void irq_gc_ack_clr_bit(struct irq_data *d);
void irq_gc_mask_disable_and_ack_set(struct irq_data *d);
void irq_gc_eoi(struct irq_data *d);
int irq_gc_set_wake(struct irq_data *d, unsigned int on);
/* Setup functions for irq_chip_generic */
int irq_map_generic_chip(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw_irq);
struct irq_chip_generic *
irq_alloc_generic_chip(const char *name, int nr_ct, unsigned int irq_base,
void __iomem *reg_base, irq_flow_handler_t handler);
void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
enum irq_gc_flags flags, unsigned int clr,
unsigned int set);
int irq_setup_alt_chip(struct irq_data *d, unsigned int type);
void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
unsigned int clr, unsigned int set);
struct irq_chip_generic *
devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
unsigned int irq_base, void __iomem *reg_base,
irq_flow_handler_t handler);
int devm_irq_setup_generic_chip(struct device *dev, struct irq_chip_generic *gc,
u32 msk, enum irq_gc_flags flags,
unsigned int clr, unsigned int set);
struct irq_chip_generic *irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq);
int __irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,
int num_ct, const char *name,
irq_flow_handler_t handler,
unsigned int clr, unsigned int set,
enum irq_gc_flags flags);
#define irq_alloc_domain_generic_chips(d, irqs_per_chip, num_ct, name, \
handler, clr, set, flags) \
({ \
MAYBE_BUILD_BUG_ON(irqs_per_chip > 32); \
__irq_alloc_domain_generic_chips(d, irqs_per_chip, num_ct, name,\
handler, clr, set, flags); \
})
static inline void irq_free_generic_chip(struct irq_chip_generic *gc)
{
kfree(gc);
}
static inline void irq_destroy_generic_chip(struct irq_chip_generic *gc,
u32 msk, unsigned int clr,
unsigned int set)
{
irq_remove_generic_chip(gc, msk, clr, set);
irq_free_generic_chip(gc);
}
static inline struct irq_chip_type *irq_data_get_chip_type(struct irq_data *d)
{
return container_of(d->chip, struct irq_chip_type, chip);
}
#define IRQ_MSK(n) (u32)((n) < 32 ? ((1 << (n)) - 1) : UINT_MAX)
#ifdef CONFIG_SMP
static inline void irq_gc_lock(struct irq_chip_generic *gc)
{
raw_spin_lock(&gc->lock);
}
static inline void irq_gc_unlock(struct irq_chip_generic *gc)
{
raw_spin_unlock(&gc->lock);
}
#else
static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
#endif
/*
* The irqsave variants are for usage in non interrupt code. Do not use
* them in irq_chip callbacks. Use irq_gc_lock() instead.
*/
#define irq_gc_lock_irqsave(gc, flags) \
raw_spin_lock_irqsave(&(gc)->lock, flags)
#define irq_gc_unlock_irqrestore(gc, flags) \
raw_spin_unlock_irqrestore(&(gc)->lock, flags)
static inline void irq_reg_writel(struct irq_chip_generic *gc,
u32 val, int reg_offset)
{
if (gc->reg_writel)
gc->reg_writel(val, gc->reg_base + reg_offset);
else
writel(val, gc->reg_base + reg_offset);
}
static inline u32 irq_reg_readl(struct irq_chip_generic *gc,
int reg_offset)
{
if (gc->reg_readl)
return gc->reg_readl(gc->reg_base + reg_offset);
else
return readl(gc->reg_base + reg_offset);
}
struct irq_matrix;
struct irq_matrix *irq_alloc_matrix(unsigned int matrix_bits,
unsigned int alloc_start,
unsigned int alloc_end);
void irq_matrix_online(struct irq_matrix *m);
void irq_matrix_offline(struct irq_matrix *m);
void irq_matrix_assign_system(struct irq_matrix *m, unsigned int bit, bool replace);
int irq_matrix_reserve_managed(struct irq_matrix *m, const struct cpumask *msk);
void irq_matrix_remove_managed(struct irq_matrix *m, const struct cpumask *msk);
int irq_matrix_alloc_managed(struct irq_matrix *m, const struct cpumask *msk,
unsigned int *mapped_cpu);
void irq_matrix_reserve(struct irq_matrix *m);
void irq_matrix_remove_reserved(struct irq_matrix *m);
int irq_matrix_alloc(struct irq_matrix *m, const struct cpumask *msk,
bool reserved, unsigned int *mapped_cpu);
void irq_matrix_free(struct irq_matrix *m, unsigned int cpu,
unsigned int bit, bool managed);
void irq_matrix_assign(struct irq_matrix *m, unsigned int bit);
unsigned int irq_matrix_available(struct irq_matrix *m, bool cpudown);
unsigned int irq_matrix_allocated(struct irq_matrix *m);
unsigned int irq_matrix_reserved(struct irq_matrix *m);
void irq_matrix_debug_show(struct seq_file *sf, struct irq_matrix *m, int ind);
/* Contrary to Linux irqs, for hardware irqs the irq number 0 is valid */
#define INVALID_HWIRQ (~0UL)
irq_hw_number_t ipi_get_hwirq(unsigned int irq, unsigned int cpu);
int __ipi_send_single(struct irq_desc *desc, unsigned int cpu);
int __ipi_send_mask(struct irq_desc *desc, const struct cpumask *dest);
int ipi_send_single(unsigned int virq, unsigned int cpu);
int ipi_send_mask(unsigned int virq, const struct cpumask *dest);
#ifdef CONFIG_GENERIC_IRQ_MULTI_HANDLER
/*
* Registers a generic IRQ handling function as the top-level IRQ handler in
* the system, which is generally the first C code called from an assembly
* architecture-specific interrupt handler.
*
* Returns 0 on success, or -EBUSY if an IRQ handler has already been
* registered.
*/
int __init set_handle_irq(void (*handle_irq)(struct pt_regs *));
/*
* Allows interrupt handlers to find the irqchip that's been registered as the
* top-level IRQ handler.
*/
extern void (*handle_arch_irq)(struct pt_regs *) __ro_after_init;
#else
#ifndef set_handle_irq
#define set_handle_irq(handle_irq) \
do { \
(void)handle_irq; \
WARN_ON(1); \
} while (0)
#endif
#endif
#endif /* _LINUX_IRQ_H */